Bimodal PMOs via Pseudomorphic Transformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing mesoporous organosilicates face challenges such as hydrophilic surfaces, pore blockage, inhomogeneous pore distribution, and difficulty in adjusting macroscopic shape due to sol-gel chemistry, which limits the variability of pore size and functionalization.
Innovation Solution
A method involving pseudomorphic transformation of monomodal mesoporous or macroporous glass using multiply silylated organosilanes, structure-directing agents, and functional components to create bimodal periodic mesoporous organosilicates with adjustable pore size and geometry, maintaining the macroscopic shape and achieving a homogeneous distribution of functional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sol-gel chemistry is used to produce mesoporous organosilicates, then functionalization can be achieved, but the macroscopic shape cannot be freely adjusted and crack formation occurs
Solution Approach 1:
The macroscopic shape is predetermined by selecting a glass precursor with the desired shape (spheres, granules, monolithic forms) before the sol-gel process begins. This preliminary action allows the final product to maintain the intended shape while undergoing functionalization through sol-gel chemistry, avoiding crack formation by not attempting to change shape during the process.
2Object-affected harmful factors
If organofunctional inorganic anchor groups are used to ensure hydrophobing, then hydrophobicity can be achieved, but the surface becomes less chemically resistant
Solution Approach 1:
The patent applies organofunctional inorganic anchor groups selectively at the surface level to provide hydrophobicity where needed, while the bulk material maintains its chemically resistant inorganic structure. This local application of functional groups achieves hydrophobicity without compromising the overall chemical resistance of the material.
3Adaptability or versatility
If post-preparative application of organic groups is used, then functionalization can be achieved, but pore closure occurs and porosity decreases
Solution Approach 1:
The patent incorporates organosilane precursors into the sol-gel process before pore formation occurs. This preliminary incorporation allows organic groups to be integrated into the framework during gelation, preventing pore closure that would occur with post-preparative application, while still achieving the desired functionalization.
4Manufacturing precision
If conventional endotemplate method is used to produce PMOs, then periodic mesoporous structure can be achieved, but pore size variability is limited and inhomogeneous distribution occurs
Solution Approach 1:
The patent changes the template parameter by using microemulsion templates with variable composition ratios (water-to-surfactant ratios) to control pore size. By adjusting these parameters, the method achieves both periodic mesoporous structure and variable pore sizes (2-50 nm range) with homogeneous distribution, overcoming the limitations of conventional endotemplate methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces bimodal PMOs with a narrow pore radius distribution, high specific surface area, and dimensional stability, enabling flexible geometry and functionalization, suitable for applications as filter, sensor, or carrier materials.
Implementation Method 1
A method involving pseudomorphic transformation of monomodal mesoporous or macroporous glass using multiply silylated organosilanes, structure-directing agents, and functional components to create bimodal periodic mesoporous organosilicates
Implementation Method 2
The condensation of bissilylated organosilanes with the addition of structure-directing agents (e.g. surfactants) to periodic mesoporous organosilicates (PMOs)
Implementation Method 3
drying and cross-linking the at least one multiply silylated organosilane on the surface of the monomodal mesoporous or macroporous glass
Implementation Method 4
using the sol-gel process and pseudomorphic transformation, mesoporous glasses can be produced having a specific surface area of over 1000 m2/g, a narrow pore distribution and a high long-range order
Implementation Method 5
extracting the structure-directing agent
Implementation Method 6
at least one functional component is added after step a) and/or after step e)
Data Source
AI summary
The invention relates to a method for producing functionalised bimodal periodic mesoporous organosilicates (PMOs) by means of pseudomorphic transformation, to functionalised bimodal periodic mesoporous organosilicates (PMOs) that comprise at least one organosilicate and at least one functional component, and to the use of the PMO as a filter material, adsorption means, sensor material or carrier material for pharmaceutical products, insecticides or pesticides.